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  2. Spinel - Wikipedia

    en.wikipedia.org/wiki/Spinel

    It is widely used as an inexpensive cut gem in birthstone jewelry for the month of August. Light blue synthetic spinel is a good imitation of aquamarine beryl, and green synthetic spinel is used as an emerald or tourmaline simulant. [29] By 2015, transparent spinel was being made in sheets and other shapes through sintering. [30]

  3. Spinel group - Wikipedia

    en.wikipedia.org/wiki/Spinel_group

    Cobalt spinels: Manganesecobaltite: Mn 1.5 Co 1.5 O 4 [8] Vanadium spinels: Coulsonite: FeV 2 O 4; Magnesiocoulsonite: MgV 2 O 4; Others with the spinel structure: Ringwoodite: (Mg,Fe) 2 SiO 4, an abundant olivine polymorph within the Earth's mantle from about 520 to 660 km depth, and a rare mineral in meteorites; Musgravite: Be(Mg,Fe,Zn) 2 Al ...

  4. Vladyslav Yavorskyy - Wikipedia

    en.wikipedia.org/wiki/Vladyslav_Yavorskyy

    He possesses the world’s largest and famous cobalt blue spinel from Luc Yen mine in Vietnam, and one of the largest red spinel weighing 110 carat. [14] Yavorskyy is the author of Terra Spinel, a book he privately published and printed in 2010. [15] The book contains images that document some of his spinel finds over the years.

  5. Chelsea filter - Wikipedia

    en.wikipedia.org/wiki/Chelsea_filter

    However, although this filter is unable to predictably discriminate between natural and synthetic emerald, it has been subsequently found capable of distinguishing aquamarine, blue topaz, and their blue synthetic spinel simulants, because unlike natural gemstones, blue cobalt-containing synthetic spinels emit a red fluorescence under white light.

  6. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    This is a list of gemstones, organized by species and types. Minerals There ... Spinel. Ceylonite (var.) Spodumene. Hiddenite (var.) Kunzite (var.) Triphane (var ...

  7. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    A gemstone (also called a fine gem, ... Synthetic spinel was first produced by accident. ... Cobalt for dark blue sapphire;

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